Coherently interruptible frequency hopped chirp generator
First Claim
Patent Images
1. A circuit comprising:
- synthesizing means for generating fixed frequency signals;
chirp generating means for generating chirp signals from a digital memory storing a chirp signal sample; and
chirp sub-pulse generating means responsive to the fixed frequency signals and the chirp signals for generating a plurality of coherently interruptible and frequency selectable chirp sub-pulses.
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Abstract
A coherently interruptible frequency hopped chirp waveform generator has aignal generating synthesizer and a chirp generator with digitally stored chirp samples in which both are phase locked to a reference clock and responsive to a timing and control circuit. The digitally stored chirp signal sample is D/A converted and mixed with a fixed frequency signal generated by the synthesizer forming translated chirp signals. The translated chirp signals are output, being controlled by a timing and control circuit so that a plurality of coherently interruptible and frequency selectable chirp sub-pulses are formed.
24 Citations
12 Claims
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1. A circuit comprising:
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synthesizing means for generating fixed frequency signals; chirp generating means for generating chirp signals from a digital memory storing a chirp signal sample; and chirp sub-pulse generating means responsive to the fixed frequency signals and the chirp signals for generating a plurality of coherently interruptible and frequency selectable chirp sub-pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit comprising:
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synthesizing means for generating fixed frequency signals; chirp generating means for generating chirp signals from a digital memory storing a chirp signal sample; mixing means for mixing the chirp signals with the fixed frequency signals forming translated chirp signals; output means connected to said mixing means; timing and control means for controlling the frequency of the fixed frequency signals generated by said synthesizing means, and for controlling said chirp generating means to generate the chirp signals stored in the digital memory at selectable increments of time and at selectable points in the memory so that the fixed frequency signals and the chirp signals are phase matched at selectable increments of time, and for controlling said output means to output the translated chirp signals in the form of a plurality of coherently interruptible and frequency selectable chirp sub-pulses. - View Dependent Claims (10, 12)
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11. A coherently interruptible frequency hopped chirp waveform generator comprising:
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a reference clock; synthesizing means responsive to said reference clock for generating quadrature fixed frequency signals; chirp generating means locked onto said reference clock for generating quadrature chirp signals from a digital memory storing a quadrature chirp signal sample; mixing means for mixing the quadrature fixed frequency signals with the quadrature chirp signals forming translated quadrature chirp signals; timing and control means phase locked onto said reference clock for adjustably controlling the frequency of the quadrature fixed frequency signals generated by said synthesizing means and for controlling said chirp generating means to selectively generate the quadrature chirp signals from various read points in the digital memory at selectable increments of time so that the quadrature fixed frequency signals and the quadrature chirp signals are phase matched and frequency selectable; and output means connected to said mixing means and responsive to said timing and control means for outputting the mixed quadrature chirp signals in the form of a plurality of coherently interruptible and frequency selectable chirp sub-pulses.
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Specification